Influence of prey stage on survival, development and life table of the predacious mite, Neoseiulus barkeri (Hughes) (Acari: Phytoseiidae)

Momen, F. M. and Hussein, H. (2011) Influence of prey stage on survival, development and life table of the predacious mite, Neoseiulus barkeri (Hughes) (Acari: Phytoseiidae). Acta Phytopathologica et Entomologica Hungarica, 46 (2). pp. 319-328. ISSN 0238-1249

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Abstract

Influence of various prey stages of the pest Tetranychus urticae Koch on survival, development, and reproduction as well as the life table parameters of the predacious mite Neoseiulus barkeri (Hughes) was studied under laboratory conditions. Neoseiulus barkeri females lived shorter (36.31 days versus 45.00), had a higher total fecundity (64.81 eggs female−1 versus 53.81 eggs female−1) and a higher daily fecundity rate (2.76 eggs female−1 day−1 versus 1.78 eggs female−1 day−1), and exhibited a higher intrinsic rate of increase (0.339 individuals female−1 day−1 versus 0.226 individuals female−1 day−1) and shorter generation time (11.60 days versus 15.70 days), at 28–30 °C, 70–75% RH under continuous fluorescent light, when reared on a diet of larvae rather than a diet on mixed nymph stages of T. urticae on raspberry leaf disks. The sex ratio of the progeny was strongly female biased recorded when female of N. barkeri fed on larvae and nymphs of T. urticae. The adult female of N. barkeri consumed daily an average of 25.0 larvae versus 82.0 eggs (24–48-h old) of T. urticae during its life cycle, while it was increased to 48.6 larvae versus 80.5 eggs (24–48-h old) daily during the adult stage. Neoseiulus barkeri failed to develop beyond the protonymphal stage when the predator offered eggs (0–24-h old) of T. urticae as food. Larvae of T. urticae proved to be the most favorable stage of T. urticae for N. barkeri, while the eggs (24–48-h old) were the least.

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